Smart structures based on carbon fibre reinforced
polymers with embedded piezoceramic patches demand and
offer permanent and integral monitoring of structural and
functional integrity. Electrical impedance spectroscopy is one
method that can be implemented in a structural health
monitoring system.
Experimental investigations with strip-shaped specimens show the
close connection between mechanical properties and impedance.
An electrical equivalent circuit diagram and electromechanical
finite-element modelling explain the general shape of the
impedance spectrogram and the peaks due to the excited
eigenmodes of the structure. Damage, caused by low-speed
impact, is experimentally detected by changes in the impedance
resonance peaks. The finite-element model confirms
this theoretically.
The influence of disturbing factors on the impedance such as ageing
effects, mechanical loading and different electrical contacting
is also considered.
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